1-(2,6-Dimethylphenyl)ethanone

This substance is typically encountered as a clear, colorless to pale yellow liquid at ambient temperature, possessing a characteristic aromatic ketone odor reminiscent of acetophenone with a slightly woody nuance. Its molecular formula is C10H12O, corresponding to a molecular weight of 148.20. The boiling point is approximately 215–220 °C at atmospheric pressure, with a calculated density near 0.99 g/cm³ at 20 °C. It is freely miscible with common organic solvents including ethanol, diethyl ether, acetone, and toluene, while exhibiting negligible solubility in water and aliphatic hydrocarbons. The molecule consists of a phenyl ring bearing two methyl groups at the 2 and 6positions and an acetyl group at the 1position. The ketone carbonyl is susceptible to nucleophilic addition and condensation reactions, while the orthomethyl groups create significant steric hindrance around the carbonyl center. Storage in tightly sealed containers protected from light and moisture at ambient temperature is generally adequate. Contact with strong oxidizing agents and strong bases should be avoided.

1(2,6Dimethylphenyl)ethanone, also known as 2',6'-dimethylacetophenone, is a sterically hindered aromatic ketone featuring an acetyl group flanked by two methyl substituents in the ortho positions. This substitution pattern creates a congested environment around the carbonyl carbon, which profoundly influences both its chemical reactivity and conformational behavior. The two methyl groups restrict rotation of the acetyl group and shield the carbonyl from nucleophilic attack, making it less reactive than unhindered acetophenone derivatives. The aromatic ring itself is electronrich due to the electrondonating methyl substituents, which can influence electrophilic substitution patterns. This combination of a hindered ketone and a multiply substituted aromatic core makes the compound a valuable model for studying steric effects in organic reactions and a useful intermediate in the synthesis of more complex molecules where controlled reactivity and defined spatial arrangement are required.

Pharmaceutical Intermediate
This hindered acetophenone derivative is employed in the synthesis of various therapeutic agents, including antifungal compounds and enzyme inhibitors. The sterically protected carbonyl can undergo selective transformations under controlled conditions, enabling the introduction of chiral centers or other functional groups with defined stereochemistry. Derivatives prepared from this scaffold have been explored for their potential activity against fungal infections and metabolic disorders, where the orthodimethylphenyl moiety contributes to improved metabolic stability and target binding through hydrophobic interactions.

Building Block for Sterically Hindered Ligands
The compound serves as a precursor for preparing phosphine ligands and other metalbinding motifs used in asymmetric catalysis. The rigid, hindered framework can impart stereochemical control in transitionmetalcatalyzed reactions such as hydrogenation, crosscoupling, and hydroformylation. The orthomethyl groups create a welldefined chiral environment when resolved or incorporated into enantiomerically pure ligands, enabling high enantioselectivity in catalytic transformations.

Fragrance and Flavor Ingredient
Acetophenone derivatives are valued in perfumery for their sweet, floral, and almondlike notes. This particular analog contributes additional woody and balsamic nuances due to the methyl substitutions, making it useful in formulating complex fragrance compositions for soaps, detergents, and cosmetics. Its stability and fixative properties help prolong the longevity of scent profiles in consumer products.

Organic Synthesis Intermediate
As a versatile synthetic building block, 1(2,6dimethylphenyl)ethanone participates in diverse transformations including BaeyerVilliger oxidation to yield phenolic esters, reduction to the corresponding secondary alcohol, and condensation reactions to form α,βunsaturated ketones. The hindered nature of the carbonyl can be exploited to achieve regioselective transformations in the presence of less hindered ketones. Its utility extends to the synthesis of natural product analogs and functional materials where the 2,6dimethylphenyl group imparts desirable steric and electronic properties.